Beryllia vs. Mullite
Both beryllia and mullite are oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is beryllia and the bottom bar is mullite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1650 | |
| 800 |
| Elastic (Young's, Tensile) Modulus, GPa | 350 | |
| 110 to 170 |
| Flexural Strength, MPa | 240 | |
| 130 to 160 |
| Poisson's Ratio | 0.26 | |
| 0.25 |
| Tensile Strength: Ultimate (UTS), MPa | 140 | |
| 160 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1750 | |
| 1680 |
| Specific Heat Capacity, J/kg-K | 1050 | |
| 950 |
| Thermal Conductivity, W/m-K | 270 | |
| 3.5 to 11 |
| Thermal Expansion, µm/m-K | 8.0 | |
| 5.8 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.6 | |
| 6.3 |
| Dielectric Strength (Breakdown Potential), kV/mm | 11 | |
| 16 to 17 |
| Electrical Dissipation At 1 MHz | 0.00060 | |
| 0.0025 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 | |
| 10 to 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.9 | |
| 2.7 to 3.0 |
Common Calculations
| Stiffness to Weight: Axial, points | 67 | |
| 22 to 31 |
| Stiffness to Weight: Bending, points | 82 | |
| 58 to 62 |
| Strength to Weight: Axial, points | 14 | |
| 15 to 17 |
| Strength to Weight: Bending, points | 21 | |
| 22 to 24 |
| Thermal Diffusivity, mm2/s | 89 | |
| 1.4 to 3.7 |
| Thermal Shock Resistance, points | 3.6 | |
| 12 to 19 |